Consulta: creatorFacets:"Mora,Freddy"
Registros recuperados: 30
Data/hora: 04/06/2024 10:43:50

Heterozygosity following half-sib recurrent selection in popcorn using isoenzyme markers
Provedor de dados: 69
Autores: Pereira,Liz Kazmirczak; Scapim,Carlos Alberto; Mangolin,Claudete Aparecida; Machado,Maria de Fátima Pires da Silva; Pacheco,Cleso Antônio Patto; Mora,Freddy.
Isozyme biochemical marker may be useful tool for genomic analysis of maize populations undergoing recurrent selection. Thus, isozymes markers was utilized for assess the changes in the genetic variability and distance in a Brazilian composite population of popcorn following four cycles of recurrent selection for yield. One hundred and ninety-six half-sib families were evaluated from each cycle and the ten highest-yielding families (5.2%) were recombined to produce the next cycle. Isozyme analysis considered 80 seedlings per cycle. Simple linear regression equations were estimated among the allele frequencies in each locus in function of the selection cycles, the genetic distances among the cycles and the average heterozygosity per locus for each cycle....
Tipo: Journal article
Palavras-chave: Allozymes frequency; Genetic distance; Selection cycles; Zea mays.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582008000100004

Bayesian genetic parameters for body weight and survival of Nile tilapia farmed in Brazil
Provedor de dados: 86
Autores: Santos,Alexandra Inês; Ribeiro,Ricardo Pereira; Vargas,Lauro; Mora,Freddy; Alexandre Filho,Luiz; Fornari,Darci Carlos; Oliveira,Sheila Nogueira de.
The objective of this study was to estimate genetic parameters for survival and weight of Nile tilapia (Oreochromis niloticus), farmed in cages and ponds in Brazil, and to predict genetic gain under different scenarios. Survival was recorded as a binary response (dead or alive), during harvest time in the 2008 grow-out period. Genetic parameters were estimated using a Bayesian mixed linear-threshold animal model via Gibbs sampling. The breeding population consisted of 2,912 individual fish, which were analyzed together with the pedigree of 5,394 fish. The heritabilities estimates, with 95% posterior credible intervals, for tagging weight, harvest weight and survival were 0.17 (0.09-0.27), 0.21 (0.12-0.32) and 0.32 (0.22-0.44), respectively. Credible...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Oreochromis niloticus; Correlation; Fish genetic improvement; Gibbs sampling; GIFT strain; Heritability.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2011000100005

Association mapping of drought tolerance indices in wheat: QTL-rich regions on chromosome 4A
Provedor de dados: 63
Autores: Ballesta,Paulina; Mora,Freddy; Del Pozo,Alejandro.
ABSTRACT Drought is likely the main abiotic stress that affects wheat yield. The identification of drought-tolerant genotypes represents an effective way of dealing with the continuous decrease in water resources as well as the increase in world population. The aim of this study was to identify single nucleotide polymorphisms (SNP) associated with drought tolerance indices in wheat by using a genome-wide association study (GWAS) under fully irrigated and rain-fed conditions. The drought tolerance indices (i.e., Stress Susceptibility Index, Stress Tolerance Index, Tolerance Index and Yield Stability Index) were calculated based on grain yield, 1,000-kernel weight and kernels per spike. The association panel was genotyped using genotyping-by-sequencing...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: SNP markers drought; Genome-wide association study; Rain-fed conditions.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162020000201101

Genetic diversity assessed by microsatellite markers in sweet corn cultivars
Provedor de dados: 63
Autores: Lopes,Ana Daniela; Scapim,Carlos Alberto; Machado,Maria de Fátima Pires da Silva; Mangolin,Claudete Aparecida; Silva,Tereza Aparecida; Cantagali,Liriana Belizário; Teixeira,Flávia França; Mora,Freddy.
Information on genetic diversity is essential to the characterization and utilization of germplasm. The genetic diversity of twenty-two sweet corn cultivars (seventeen open-pollinated varieties, OPV, and five hybrids, H) was investigated by applying simple sequence repeat markers. A total of 257 primers were tested, of which 160 were found to be usable in terms of high reproducibility for all the samples tested; 45 were polymorphic loci, of which 30 were used to assess the genetic diversity of sweet corn cultivars. We detected a total of 86 alleles using 30 microsatellite primers. The mean polymorphism was 82 %. The highest heterozygosity values (Ho = 0.20) were found in the PR030-Doce Flor da Serra and BR427 III OPVs, whereas the lowest values (0.14) were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Simple sequence repeats; Neighbor-joining; Maize germplasm.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162015000600513

Predicción de Valores Genéticos del Efecto de Poblaciones de Maíz Evaluadas en Brasil y Paraguay
Provedor de dados: 113
Autores: Mora,Freddy; Scapim,Carlos Alberto.
El objetivo de este estudio fue evaluar el comportamiento de siete poblaciones de maíz ( Zea mays L.) tipo roseta, o palomita, de la raza Avati Pichinga , establecidas en diferentes localidades de Brasil y Paraguay. Se determinó la mejor predicción lineal no sesgada empírica (EBLUP), con estimaciones de parámetros de covarianza vía método de máxima verosimilitud restringida (REML), en características de importancia comercial y agronómica. Se investigaron diez modelos con diferentes estructuras de covarianzas en la matriz intergenotípica. Los criterios de información de Akaike y Bayesiano de Schwarz se utilizaron para la comparación entre los modelos. Las estructuras de covarianza escogidas fueron Diagonal de tres bandas para el rendimiento de granos,...
Tipo: Journal article
Palavras-chave: Estructuras de covarianzas; Rendimiento; Capacidad de expansión.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000200003

Comparación del cariotipo de Eucalyptus globulus y Eucalyptus cladocalyx (Myrtaceae)
Provedor de dados: 113
Autores: Mora,Freddy; Palma-Rojas,Claudio; Jara-Seguel,Pedro.
Se analizaron placas metafásicas mitóticas de Eucalyptus globulus Labill. y Eucalyptus cladocalyx F. Muell. Los cromosomas se observaron mediante aplastado de meristemas radiculares, previamente tratados con 8-Hidroxiquinolina y teñidos con la reacción de Feulgen. Las dos especies mostraron un cariotipo 2n = 22, con un nivel de simetría 1A y con tamaños cromosómicos que variaron entre 0,68 y 2,03 m m. El tamaño cromosómico promedio difirió significativamente al comparar entre E. globulus (1,42 m m) y E. cladocalyx (1,02 m m) (P &lt; 0,01). El mayor tamaño cromosómico de E. globulus sugiere una mayor cantidad de ADN, originado probablemente por alteraciones cromosómicas estucturales. Este patrón de evolución del cariotipo estaría asociado, además, con un...
Tipo: Journal article
Palavras-chave: Cromosoma; Citogenética vegetal.
Ano: 2005
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072005000100002

Características Fisiológicas, Contenido de Aceite y Proteína en Genotipos de Soya, Evaluadas en Diferentes Sitios y Épocas de Cosecha, Brasil
Provedor de dados: 113
Autores: Minuzzi,Andréia; Mora,Freddy; Sedrez Rangel,Marco Antônio; De Lucca e Braccini,Alessandro; Scapim,Carlos Alberto.
El objetivo del presente estudio fue evaluar características fisiológicas, contenido de aceite y de proteínas en las semillas de cuatro cultivares de soya (Glycine max (L.) Merr.)) (BRS 133, BRS 206, BRS 239 y CD 202), colectadas en cuatro épocas (estado R7, 7, 14 y 21 días después de la primera época) y producidas en dos sitios, Sidrolândia (21º00’ lat. Sur, 55º01’ long. Oeste), y Dourados (22º11’ lat. Sur, 54º55’ long. Oeste) del Estado de Mato Grosso do Sul, Brasil, en la temporada agrícola 2004-2005. Se utilizó un diseño experimental de bloques completos al azar con tres repeticiones y con tratamientos en parcelas subdivididas. Las semillas fueron evaluadas a través de pruebas de germinación, envejecimiento acelerado y emergencia de las plantas en...
Tipo: Journal article
Palavras-chave: Germinación; Atraso de cosecha; Cultivares.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072007000400003

Evaluación genética de clones de olivo en el desierto de Atacama, Chile
Provedor de dados: 115
Autores: Mora,Freddy; Tapia,Francisco; Ibacache,Antonio; Nunes-Martins,Elias; Scapim,Carlos Alberto.
El olivo (Olea europaea L.) es una especie económicamente importante para países con clima mediterráneo y ha sido una alternativa apropiada y útil para los sistemas agrícolas intensivos en las zonas áridas de Chile. Por este motivo, el objetivo del presente trabajo fue determinar los componentes de varianza, heredabilidad en sentido amplio y la predicción de valores genéticos usando técnicas Bayesianas, en veintiocho clones de olivo evaluados en el sur del Desierto de Atacama. Se usó el algoritmo de cadenas independientes para estimar las distribuciones de los parámetros a posteriori. El experimento de campo se estableció en 2000 y se monitorearon seis características cuantitativas en distintos periodos por seis años. Las estimaciones de heredabilidad y...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Olea europaea L.; Heredabilidad; Inferencia Bayesiana; Zonas áridas.
Ano: 2008
URL: http://www.scielo.org.mx/scielo.php?script=sci_arttext&pid=S1405-31952008000700004

Bayesian analysis of growth, stem straightness and branching quality in full-sib families of Eucalyptus globulus
Provedor de dados: 53
Autores: Mora,Freddy; Ballesta,Paulina; Serra,Nicolle.
ABSTRACT Eucalyptus globulus is one of the most commonly planted hardwood species for industrial use in various temperate regions around the world. The present study aimed to evaluate 62 full-sib families of E. globulus in one of the southernmost progeny trials of the species in the south of Chile. Estimates of genetic parameters for stem straightness, branching quality and growth traits were based on a Bayesian modelling approach using Gibbs sampling. A Bayes Factor (BF) analysis supported the hypothesis of significant additive genetic variation for all traits under study. Conversely, the BF supported a model with significant dominance effects for the diameter at breast height and stem volume, which explained up to 25% of the phenotypic variation. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bayes factor; Credible region; Gibbs sampling; Quality traits; Threshold models.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052019000300328

A classification proposal for coefficients of variation in Eucalyptus experiments involving survival, growth and wood quality variables
Provedor de dados: 53
Autores: Mora,Freddy; Arriagada,Osvin.
ABSTRACT The objective of this study was to present a classification proposal for coefficients of variation (CV) in Eucalyptus experiments, aiming at providing a useful tool for experiments involving growth, survival and wood quality traits. Ninety-four studies were selected from a search for peer-reviewed journals yielding a total of 508 data. The CVs were classified as low, moderate, high and very high. The mean, standard deviation, maximum and minimum values, skewness and kurtosis were estimated to describe the distribution shape. The Shapiro-Wilk test confirmed that all variables satisfied the assumption of normality (p &lt; 0.05). The results indicated that the growth traits had the highest variability, being variables strongly affected by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Eucalyptus spp.; Experimental accuracy; Experimental error; Rank-ordering.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052016000300263

Popcorn germplasm resistance to fungal diseases caused by Exserohilum turcicum and Bipolaris maydis
Provedor de dados: 53
Autores: Kurosawa,Railan do Nascimento Ferreira; Vivas,Marcelo; Amaral,Antonio Teixeira do; Ribeiro,Rodrigo Moreira; Miranda,Samila Barbosa; Pena,Guilherme Ferreira; Leite,Jhean Torres; Mora,Freddy.
ABSTRACT Compared with the common corn, popcorn shows greater susceptibility to pests and diseases occurrence, being the use of resistant cultivars the most efficient strategy. In this regard, Germplasm Banks deserve special attention because they contain accessions that can be used as sources of resistance in breeding programs. The State University of Northern Rio de Janeiro (UENF) maintains a popcorn Germplasm Bank with accessions from tropical and temperate countries, including Diversity Centers for the species. In this study, we investigated the performance of 37 popcorn accessions landraces, hybrids, and inbreed lines ― from the Germplasm Collection of UENF’s Popcorn Breeding Program with respect to the fungal leaf diseases northern leaf blight (NLB)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zea mays; Northern leaf blight; Genetic resistance; Plant breeding.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052018000100036

Generalized lineal models for the analysis of binary data from propagation experiments of Brazilian orchids
Provedor de dados: 52
Autores: Mora,Freddy; Gonçalves,Letícia de Menezes; Scapim,Carlos Alberto; Martins,Elias Nunes; Machado,Maria de Fátima Pires da Silva.
This study aimed at applying the generalized linear models (GLM) for the analysis of a germination experiment of Cattleya bicolor in which the response variable was binary. The purpose of this experiment was to assess the effects of the storage temperatures and culture mediums on the seed viability. The analyses of variance was also carried out either with or without the data transformation. All the statistical approaches indicated the importance of the storage temperature on the seed viability. But, the culture media and interaction effects were significant only by the GLM. Based on the GLM, the seeds stored at 10°C increased viability, in which the coconut medium achieved the best performance. The results emphasized the importance of adopting the GLM to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cattleya bicolor; Deviance; In vitro culture; Logit model; Maximum-likelihood.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000500013

Bayesian analysis of the genetic structure of a Brazilian popcorn germplasm using data from simple sequence repeats (SSR)
Provedor de dados: 117
Autores: Saavedra,Javier; Silva,Tereza Aparecida; Mora,Freddy; Scapim,Carlos Alberto.
Several studies have confirmed that popcorn (Zea mays L. var. everta) has a narrow genetic basis, which affects the quality of breeding programs. In this study, we present a genetic characterization of 420 individuals representing 28 popcorn populations from Brazilian germplasm banks. All individuals were genotyped using 11 microsatellite markers from the Maize Genetics and Genomics Database. A Bayesian clustering approach via Monte Carlo Markov chains was performed to examine the genetic differentiation (Fst values) among different clusters. The results indicate the existence of three distinct and strongly differentiated genetic groups (K = 3). Moreover, the Fst values (calculated among clusters) were significantly different according to Bayesian credible...
Tipo: Journal article
Palavras-chave: Genetic differentiation; Microsatellite markers; Bayesian clustering; Monte Carlo Markov chains.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392013000200003

Preliminary Evaluation of 29 Olive (Olea europaea L.) Cultivars for Production and Alternate Bearing, in the Huasco Valley, Northern Chile
Provedor de dados: 117
Autores: Tapia C,Francisco; Mora,Freddy; Santos,Alexandra I.
There is increasing interest in the development of intensively managed olive orchards (Olea europaea L.) in northern Chile. The selection of specific varieties that perform well on a particular site is considered crucial to maximizing productivity. The present study was undertaken to evaluate the productive performance of 29 varieties of olive in the Huasco Valley (28°34' S, 70°47' W), Northern Chile.The traits evaluated were: mean olive production per tree considering a longitudinal (PML) analysis over a period of five years, 2003 to 2007, total olive production in the same period (PA03-07) and alternate bearing index (ABI). The effect of variety was highly significant (p &lt; 0.01) for all traits. In the field trial, IAP was moderate (0.52), with PML...
Tipo: Journal article
Palavras-chave: Olive fruit; Alternate bearing.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000300004

Bayesian Analysis of the Genetic Control of Survival in F3 Families of Common Bean
Provedor de dados: 117
Autores: Mora,Freddy; Gonçalves-Vidigal,Maria C; Santos,Alexandra I.
The objectives of this study were to examine the genetic control of survival in segregant families F3 of the common bean (Phaseolus vulgaris L.) in southern Brazil during the 2004-2005 growing season, to identify useful genotypes for the breeding program of this crop, and to determine the genetic association between survival and weight of 100 seeds (production trait; P100). A Bayesian approach was used to predict breeding values and to estimate variance components. Survival was recorded as a binary response: dead plant or live plant during harvest. The total population consisted of 11,520 individual plants. The difference in the magnitude between the best and the worst families was as high as 22%, and varied from 57 to 73%. Survival was found to be highly...
Tipo: Journal article
Palavras-chave: Genetic improvement; Breeding; Gibbs algorithm; Heritability.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392008000400003

Evaluation of Top-Cross Popcorn Hybrids Using Mixed Linear Model Methodology
Provedor de dados: 117
Autores: Arnhold,Emmanuel; Mora,Freddy; G. Silva,Ricardo; I.V. Good-God,Pedro; Rodovalho,Marcos A.
The market for popcorn (Zea mays L.) has been continuously growing in Brazil fact has required the development of cultivars adapted to local environmental conditions. For this reason, the analytical objectives of this study were to evaluate top-cross popcorn hybrids in relation to popping expansion and grain yield in three different eco-geographic regions of Brazil, in order to estimate variance components using Restricted Maximum Likelihood (REML) and predict breeding values using Best Linear Unbiased Prediction (BLUP). Genetic evaluation considered a linear model with heterogeneous residual (environmental) variances. The Restricted Likelihood Ratio Test (RLRT) evidenced significant differences (p &lt; 0.01) for the genotypic effect. Grain yield showed a...
Tipo: Journal article
Palavras-chave: Popping expansion; REML; BLUP; Improvement.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392009000100006

Genetic parameters of growth and survival in Acacia saligna shrubs
Provedor de dados: 118
Autores: Mora,Freddy; Perret,Sandra; Scapim,Carlos Alberto; Arnhold,Emmanuel.
Acacia species have valuable agronomic characteristics, such as the tolerance to unfavorable environmental conditions. In this study, genetic parameters and selection response in Acacia saligna shrubs were investigated in two arid environments of northern Chile: Cuz-Cuz and El Tangue. The quantitative traits were assessed in 5 year-old shrubs. A Bayesian approach, implemented using Gibbs sampling algorithm, was used in the data analysis. The tree survival was 87.3% and 81.8% in Cuz-Cuz and El Tangue, respectively, confirming the potential of A. saligna in northern Chile. The estimates of posterior mode of the heritability ranged from h2=0.13 (survival) to h2=0.25 (shrub crown diameter). Estimated genetic gain (individual tree selection) ranged from 6 to...
Tipo: Journal article
Palavras-chave: Drylands; Fodder production; Acacia saligna; Multipurpose trees; Bayesian analysis.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000200001

In vitro bulbing for the propagation of Traubia modesta (Amaryllidaceae), a threatened plant endemic to Chile
Provedor de dados: 118
Autores: Paredes,Kelly; Delaveau,Catherine; Carrasco,Pedro; Baeza,Carlos; Mora,Freddy; Uribe,Matilde E.
K. Paredes, C. Delaveau, P. Carrasco, C. Baeza, Freddy Mora, and M.E. Uribe. 2014. In vitro bulbing for the propagation of Traubia modesta (Amaryllidaceae), a threatened plant endemic to Chile. Cien. Inv. Agr. 41(2): 207-214. Critically endangered, Traubia modesta is endemic to Chile and belongs to the family Amaryllidaceae. In this research, a propagation protocol was developed for the in vitro cultivation of vegetative organs for this species. The twin scale explants were cultured in a Murashige and Skoog (MS) medium, supplemented with the growth regulators naphthaleneacetic acid (NAA) and 6-benzylaminopurine (BAP) in different concentrations. Plant preservative mixture (PPM) and polyvinyl pyrrolidone (PVP) were used as a biocide and an antioxidant,...
Tipo: Journal article
Palavras-chave: Bulbing; Critically endangered species; In vitro propagation; Traubia modesta; Twin scales.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202014000200007

Inbreeding depression and genetic components for popping expansion and other traits in Brazilian populations of popcorn
Provedor de dados: 118
Autores: Arnhold,Emmanuel; Soriano Viana,José Marcelo; Mora,Freddy; Vieira Miranda,Glauco; Gonçalves Silva,Ricardo.
The aim of the study was to assess inbreeding depression and determine genetic components in landrace populations of popcorn. Six Brazilian popcorn landraces: Amarelo, Beija-Flor, Branco, Rosa-claro, Roxo and Viçosa, were subjected to self-pollination. Experiments with SO populations and their selfing populations (SI) were conducted in a randomized complete block design. The estimates of inbreeding depression varied from 1.2% (popping expansion) to 79% (grain yield). The gene action was predominantly additive for plant height, ear height and hundred-grain-weight. The dominance genetic effects were important for index of prolificacy and grain yield. The genetic effect of popping expansion was bidirectional with nuil dominance and a predominance of additive...
Tipo: Journal article
Palavras-chave: Zea mays L; Mprovement; Popping expansion; Popcorn; Genetic variance.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300011

Heredabilidad de la sobrevivencia en 169 familias de maíz-roseta de granos blancos: Un enfoque Bayesiano
Provedor de dados: 118
Autores: Rodovalho,Marcos de Araújo; Mora,Freddy; Santos,Elisangela Mendes dos; Scapim,Carlos Alberto; Arnhold,Emmanuel.
Durante la evaluación genética de 169 familias de medios hermanos de maíz-roseta de granos blancos (Zea mays), en el inicio de un programa de mejoramiento genético (Ciclo I) conducido en el sur de Brasil, se detectaron diferencias significativas (p &lt; 0,01) en la sobrevivencia. Consecuentemente, la sobrevivencia se incorporó dentro del programa de mejoramiento. El objetivo principal de este estudio fue examinar parámetros genéticos para la sobrevivencia, y su asociación con otras características agronómicas. Para cumplir con este objetivo se usó un enfoque Bayesiano, vía el algoritmo de Gibbs (para selección de plantas individuales) y algoritmo de cadenas independientes (para la selección de familias). La sobrevivencia (medida como una característica...
Tipo: Journal article
Palavras-chave: Algoritmo de Gibbs; Cadenas independientes; Maíz-roseta de granos blancos; Sobrevivencia; Valores genéticos; Zea mays.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000300008

Predicción del efecto de cultivares de algodón en la presencia de interacción genotipo-ambiente
Provedor de dados: 118
Autores: Mora,Freddy; Osmério,Pupim-Junior; Scapim,Carlos Alberto.
Se analizó la predicción del efecto de cultivar vía mejor predicción lineal no sesgada (BLUP), de 14 cultivares de algodón (Gossypium hirsutum) establecidos en diferentes localidades de Brasil y Paraguay, en la temporada 2003-2004. BLUP, del rendimiento de cultivares, se comparó con el análisis clásico de estabilidad de los modelos desarrollados por Plaisted y Peterson, Wricke, Annicchiarico y Lin y Binns. Un abordaje Bayesiano a través del algoritmo de cadena independiente (IC), se utilizó como otra medida de comparación. La razón de verosimilitud evidenció diferencias significativas para los efectos de cultivar e interacción genotipo-ambiente. Los criterios de información de Akaike y Bayesiano confirmaron estos resultados. La mayoría de las correlaciones...
Tipo: Journal article
Palavras-chave: BLUP; Estabilidad de cultivares; Interacción genotipo-ambiente; Mejoramiento; Modelos mixtos; Verosimilitud.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000100002

Mapeo de loci de caracteres cuantitativos (QTL) usando un enfoque multivariado
Provedor de dados: 118
Autores: Mora,Freddy; Santos,Alexandra I; Scapim,Carlos A.
Los procedimientos usados en el mapeo de loci de característica cuantitativa (QTL) son continuamente estudiados ya que son fundamentales para mejorar la precisión del análisis genético. El presente estudio tuvo como objetivo examinar QTLs a través de métodos muí ti variados, considerando el principio de mapeo por intervalo simple. Se simuló un conjunto de datos de marcadores moleculares microsatélites provenientes de una población F2. Al mismo tiempo se consideró que los QTLs controlan características de distribución normal y binomial. En el caso normal se consideraron cinco modelos con las siguientes estructuras de covarianzas residuales: Componentes de varianza (VC), simetría compuesta (CS), no estructurada (UN), diagonal principal (Banded Main Diagonal;...
Tipo: Journal article
Palavras-chave: Análisis multivariado; Binario; Ecuaciones generalizadas; Marcador molecular; Mejoramiento genético; QTL.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202008000200003

Combining genetic gain and diversity under an individual selection method in a selected provenance of Eucalyptus cladocalyx
Provedor de dados: 118
Autores: Mora,Freddy; Saavedra,Javier.
Flowering traits are becoming important breeding objectives in Eucalyptus cladocalyx. Previous studies have confirmed that the trees from Cowell, Australia, respond well for early flowering under the arid conditions in the Southern Atacama Desert, Chile. This selected population was evaluated for flowering intensity at the end of the flowering season of 2009/2010 (February 2010). A Bayesian threshold tree model via Gibbs sampling was used in the data analyses. The model included the genotype-environment interaction (two sites) using a bi-character threshold model. The posterior mean of the genetic correlation between the sites was positive and high (r=0.8) and, according to the 95% credible interval (0.44-0.96), it was significantly different from zero,...
Tipo: Journal article
Palavras-chave: Arid environmental conditions; Bayesian framework; Breeding values; Flowering components.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202012000100014

Propagation of Sophora toromiro through interspecific grafting to support species conservation: Masificación de Sophora toromiro, mediante injerto inter específico como apoyo a la conservación de la especie
Provedor de dados: 118
Autores: Espejo,Jaime; Baeza,Marcelo; Ruiz,Eduardo; Mora,Freddy; Gomez,Miguel; Montenegro,Gloria.
This report provides information on applying the cleft grafting technique in the species Sophora toromiro (Phil.) Skottsb., focused on its propagation, and contributes to the conservation of the genetic base of this species in the medium and long term. A germplasm collection was obtained via interspecific grafting using Sophora cassioides (Phil.) Sparre as rootstock, employing two variations of cleft grafting sealing. The survival of 301 S. toromiro grafts of the Titze line at ten months was 64% or 95%, according to the type of sealing performed. A second experiment, comparing the origin of the material, indicated that the plants of Goteborg origin showed survival values close to 63%, versus 58% for those from the Jardín Botánico Nacional de Viña del Mar...
Tipo: Journal article
Palavras-chave: Conservation; Graft; Sophora toromiro; S. cassioides.
Ano: 2013
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202013000100019

Generalized composite interval mapping offers improved efficiency in the analysis of loci influencing non-normal continuous traits
Provedor de dados: 118
Autores: Mora,Freddy; Scapim,Carlos Alberto; Baharum,Adam; Teixeira do Amaral Júnior,Antonio.
In genetic studies, most Quantitative Trait Loci (QTL) mapping methods presuppose that the continuous trait of interest follows a normal (Gaussian) distribution. However, many economically important traits of agricultural crops have a non-normal distribution. Composite interval mapping (CIM) has been successfully applied to the detection of QTL in animal and plant breeding. In this study we report a generalized CIM (GCIM) method that permits QTL analysis of non-normally distributed variables. GCIM was based on the classic Generalized Linear Model method. We applied the GCIM method to a F2 population with co-dominant molecular markers and the existence of a QTL controlling a trait with Gamma distribution. Computer simulations indicated that the GCIM method...
Tipo: Journal article
Palavras-chave: Bioinformatics; Generalized Linear Model; Molecular markers; Quantitative Trait Loci (QTL).
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202010000300007

In vitro rooting of Beilschmiedia berteroana, endemic to the South Central area of Chile
Provedor de dados: 118
Autores: Uribe,Matilde; Sandoval,Marian; Méndez,Amado; Mora,Freddy; Delaveau,Catherine.
Beilschmiedia berteroana ("belloto del sur") is a screrophyllous tree of the family Lauraceae that is endemic to the Central-South region of Chile. It is an endangered species; considered a second priority in the "Extinction Danger" category. This species is known for its timber, fruits and lots of mucilages, also has great potential for its size and ornamental evergreen foliage. This study had as a main objective to develop an in vitro rooting protocol of microshoots, obtained from the proliferation phase, by adding auxin: indole 3-butyric acid (IBA), naphthaleneacetic acid (NAA) and indole 3-acetic acid (IAA) in order to contribute to the recovery of the species. Results are discussed in the rooting phase, where this species is induced or maintained in...
Tipo: Journal article
Palavras-chave: Auxin; Beilschmiedia berteroana; Endangered species; Lauraceae.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202011000100010

Análisis experimental de tratamientos floculantes de residuos orgánicos derivados de la producción porcina
Provedor de dados: 118
Autores: dos Santos,Alexandre L; Mora,Freddy.
La producción porcina se considera un importante segmento de la agroindustria Brasileña, cuyo desarrollo depende en parte de la estrategia ambiental adoptada por las empresas. Se examinaron experimentos de tratamientos de residuos orgánicos en una agroindustria porcina localizada en el sur de Brasil. Los siguientes tipos de floculantes fueron considerados como cinco experimentos independientes: Tipo-1: hidróxido de calcio, Tipo-2: sulfato de aluminio + hidróxido de calcio, Tipo-3: hidróxido de calcio + dolomítico, Tipo-4: dolomítico y Tipo-5: sulfato de aluminio, con las siguientes dosis: 0,00-1,25-2,50-5,00-10,00-20,00 mL. Se analizaron los sólidos totales de la fracción sólida (gm³) en un estudio longitudinal. Un experimento paralelo se realizó para...
Tipo: Journal article
Palavras-chave: Biofertilizante; Cerdos; EG; Floculantes; MLG; Residuos orgánicos; Seudo-verosimilitud.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000100006

Variabilidad en el florecimiento de procedencias de Eucalyptus cladocalyx en la Región de Coquimbo
Provedor de dados: 118
Autores: Mora,Freddy; Perret,Sandra; Scapim,Carlos Alberto; Nunes Martins,Elias; Molina,María Paz.
Se analizó la variabilidad en el florecimiento de cinco poblaciones de Eucalyptus cladocalyx establecidos en la Región de Coquimbo. Se consideró al florecimiento como una respuesta binaria medida a los 30 meses de edad. Por lo tanto, se ajustó un modelo linear generalizado para analizar el efecto de procedencias. Posteriormente, se estudió la variabilidad genética dentro de la mejor procedencia, a través de inferencia Bayesiana, vía algoritmo de Gibbs. Inicialmente, se consideraron dos sitios, Hacienda Caracas y Tunga Norte, sector costero e interior de la Provincia de Choapa, respectivamente. En el sector costero, sólo un 1,33% de los árboles presentaron eventos de florecimiento, mientras que en Tunga Norte, este valor fue de 23,43%. Debido a este...
Tipo: Journal article
Palavras-chave: Ambientes áridos; Árboles multipropósito; Eventos de florecimiento; Mejoramiento; Procedencias.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-16202007000200006

Rendimento, teores de óleo e proteínas de quatro cultivares de soja, produzidas em dois locais no estado do Mato Grosso do Sul
Provedor de dados: 64
Autores: Minuzzi,Andréia; Rangel,Marco Antônio Sedre; Braccini,Alessandro de Lucca e; Scapim,Carlos Alberto; Mora,Freddy; Robaina,Antonio Dias.
Neste trabalho, objetivou-se avaliar o rendimento, teores de óleo e de proteínas nas sementes de quatro cultivares de soja, colhidas em quatro épocas, produzidas em dois locais (Sidrolândia e Dourados) no Estado do Mato Grosso do Sul e em dois anos agrícolas (2004/05 e 2005/06). O delineamento experimental utilizado foi em blocos casualizados com três repetições e tratamentos arranjados no esquema de parcelas subdivididas. As parcelas foram constituídas pelas cultivares de soja (BRS 133, BRS 206, BRS 239 e CD 202) e as subparcelas pelas épocas de colheita (R7 e 7, 14 e 21 dias após o primeiro período). Os dados coletados nos diferentes locais foram submetidos à análise de variância conjunta de parcelas subdivididas e, na presença de interação...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Glycine max (L.) Merrill; Produtividade; Composição química; Colheita.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542009000400015

Efeito dos compostos naturais bioativos na conservação pós-colheita de frutos de mangueira cv. Tommy Atkins
Provedor de dados: 64
Autores: Cruz,Maria Julia da Silva; Clemente,Edmar; Cruz,Maria Eugênia da Silva; Mora,Freddy; Cossaro,Leocir; Pelisson,Noemi.
A antracnose causa severos danos na pós-colheita de manga. Como o controle químico tem demonstrado desvantagens, o potencial uso de óleos essenciais para o controle de fitopatógenos tem sido uma alternativa. Neste trabalho, objetvou-se avaliar a eficácia de produtos alternativos no controle da antracnose e na conservação de mangas (Mangifera indica) cv. Tommy Atkins tratado com bicarbonato de sódio diluído em água destilada, na concentração de 3% (v/v), via imersão. Como tratamento, foram utilizados os óleos essenciais de Origanum majorana, Citrus sinensis, Cymbopogon citratus e Eucalyptus citriodora, via fumigação, na dosagem de 1000 μL e água destilada via fumigação; todos por 3 minutos. Frutos da Unidade CEASA-Maringá/PR, selecionados, pesados em...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mangifera indica; Pós-colheita; Óleo essencial; Antracnose.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542010000200022